Examples relating to determining stack height in imaging devices are described herein. According to one example, an imaging device includes an input roller assembly to transport a print medium towards an image-forming assembly of the imaging device. The input roller assembly can include a pinch roller for drawing the print medium from a media stack. The imaging device further includes a pressure plate movably coupled to a body portion of the imaging device and biased towards the pinch roller. The pressure plate may hold the media stack between itself and the pinch roller and is movable by a first distance from a neutral position when the media stack is there between. The first distance is measured from a fixed point to a measurement region on the pressure plate and can indicate an instantaneous stack height of the media stack.

A sheet conveying device includes a conveyor, a supporting section which supports a sheet to be fed to the conveyor and a guide section which is provided on the supporting section and configured to guide a sheet to the conveyor. The supporting section includes a first support region and a second support region which support a sheet. The first support region is provided at a position on an upstream side from the second support region in a sheet conveyance direction. The first support region extends substantially horizontally, and the second support region is inclined in a lower direction toward the downstream side in the conveyance direction. The guide section includes a first portion which extends substantially horizontally along the first support region, and a second portion which is connected to the first portion and extends obliquely in the lower direction along the second support region.

Provided are an image processing apparatus, a control method, and a control program to accurately determine whether or not a deflection of a fed medium has occurred, and to suitably control a feeding of the medium. A medium conveying apparatus includes a feed module to feed a medium, a motion detection module to detect a first change amount in a feeding direction of the medium placed on a medium tray and a second change amount in a direction perpendicular to a placing surface of the medium tray during feeding of the medium, a determination module to determine that a deflection of the medium has occurred when the first change amount is less than a first threshold value and the second change amount is equal to or more than a second threshold value, and a control module to stop feeding the medium according to the determination result.

An image reading device includes: a transport unit configured to transport a medium; an emission unit configured to emit an ultrasonic wave in accordance with a driving voltage and a reception unit configured to receive the ultrasonic wave, the emission unit and the reception unit being disposed so that a transport path for the medium transported by the transport unit is interposed therebetween; a reading unit configured to read the medium; and a control unit configured to detect presence or absence of multi-feed of the medium on the basis of a signal received by the reception unit. The image reading device is configured to switch a posture into any of a first posture or a second posture. The first posture is a posture in which the transport path is sloped relative to a mounting surface. The second posture is a posture in which an angle of the transport path relative to the mounting surface is smaller than that in the first posture. The control unit sets a first driving voltage as the driving voltage when the posture is the first posture, and sets a second driving voltage lower than the first driving voltage as the driving voltage when the posture is the second posture.

A sheet feeding device includes a driving roller, a driven roller rotated by the rotation of the driving roller, a non-conductive feeding guide, a conductive frame, a conductive bearing and an urging member to urge the driven roller toward the driving roller. The feeding guide includes a supporting portion to displaceably support the rotation shaft in an urging direction. The frame includes a positioning portion to position the driven roller in the urging direction by contact with the rotation shaft in a state in which the driving roller is urged by the driven roller.

An image reading apparatus includes a scanner structured to reads an image formed on a medium which is conveyed; a calibration member located opposite to the scanner and structured to reflect irradiation light to be radiated to the medium when reading an image; a first roller arranged in a fixed position and structured to guide a conveying direction of the medium passing between the scanner and the calibration member; and a second roller arranged in a variable position in accordance with the stiffness of the medium and structured to guide the conveying direction of the medium passing between the scanner and the calibration member.

A sheet tray includes a first tray and a second tray each including a first friction portion or a first contact portion, and a second friction portion or a second contact portion. In a process of movement of the second tray from a first position to a second position, the first friction portion contacts the first contact portion to deform the first contact portion and starts returning the first contact portion from a deformed shape to an original shape when the second tray is located at a position spaced apart from the second position in a second direction. The second friction portion contacts the second contact portion when the second tray moved from the first position in a first direction has reached the second position, and the second friction portion deforms the second contact portion when the second tray is moved from the second position in the first direction.

A medium feeding device includes a lower portion unit in which a feeding roller is provided, and an upper portion unit in which a separating roller is provided and which is connected to the lower portion unit so as to be openable and closable. The lower portion unit has a cover member which covers a holding portion of the feeding roller while exposing a portion of the feeding roller to the transport path, and the cover member is configured to be removable in a direction including a component directed toward an upstream side in the transport direction by being attachable to and detachable from the lower portion unit.

A first sheet conveying path extends from a sheet supply portion toward a sheet discharge portion. A second sheet conveying path extends, from a diverging position in the first sheet conveying path, toward a switch-to-back portion. A third sheet conveying path is a conveying path for the sheet that is reversed by the switch-to-back portion. A first movable guiding portion is rotatable between a first posture in which the sheet that has reached the diverging position is guided toward the sheet discharge portion, and a second posture in which the sheet is guided into the second conveying path. A second movable guiding portion is rotatable between a third posture and a fourth posture, in the second sheet conveying path. In the third posture, the second sheet conveying path is formed in conjunction with the first movable guiding portion. In the fourth posture, the third sheet conveying path is formed.

A media conveyance apparatus includes a first conveyer configured to convey media along a conveyance path, a first detector configured to detect overlap-feed of the media conveyed by the first conveyor; and a controller programmed to control operation of the first conveyor based on a detection value from the first detector, a first threshold for detection of single-feed of the media, and a second threshold for detection of overlap-feed of the media.